The common link between those two is Kenzo Futaki, a disciple of the late-19th/early 20th C. neo-Shinto revivalist Bonji Katsuwara. Futaki espoused both Katsuwara's (divinely inspired) misogo-no-gyo and the brown rice-based diet later made famous by George Ohsawa as macrobiotics. Futaki's source for the brown rice diet isn't so clear to me.

Possibly from his contemporary, and M.D. too, Ishizuka Sagen.

OTOH, I'm reading these days your dissertation on Minakata Kumagusu, very interesting.